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 Speed variations from GPS vs. Phone 
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MMT 1000 Club

Joined: Tue Jan 10, 2012 12:33 pm
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Post Speed variations from GPS vs. Phone
I see so often here guys posting their speeds via cell phone and not hand held GPS or lowrance/humminbird

I did a test with 5 variations last weekend just to see what the difference would be.
Here's what I used:

2 x cell phones using 2 different GPS apps;
1 x Garmin Fenix 3 watch;
1 x Garmin etrex 30; and
1 x lowrance 5 Elite dsi.

Phone 1 showed 32.2 mph
Phone 2 showed 33.7 mph (I liked this app ;) )
Watch showed 30.3 mph
Both the etrex and Lowrance were exactly the same at 30.2 mph.

Fun little test just to see how cell tower GPS compares to proper satellite GPS systems.
I know this isnt new news for anyone, just thought I'd share my findings.

Load was myself, wife, my 6yr old, and fishing gear.
Tailwind and current pushing us along with the fat blade on the GTR40XD spinning 4500rpm.

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B.

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Sat May 25, 2019 4:26 am
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Posts: 1872
Post Re: Speed variations from GPS vs. Phone
Thats a cool little review bro. Crazy how different the phones are from the actual units


Sat May 25, 2019 7:30 am
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MMT Elite Member

Joined: Fri Jul 08, 2011 1:54 pm
Posts: 8133
Post Re: Speed variations from GPS vs. Phone
I've said that for years, recorded my old prodrive running high 34 touching 35 on a Garmin. Not on a tin can neither.

https://youtu.be/emIBsHyb8eU

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Sat May 25, 2019 8:46 am
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Joined: Sun Aug 09, 2009 12:50 pm
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Location: Muscatine, Iowa
Post Re: Speed variations from GPS vs. Phone
Did the same with two different gps units one Garmin and one Megellan, against police radar wasn't 1 mph difference between all three. Did a timed measured mile both upstream and down stream on river and found a bit more difference in mph.


Sat May 25, 2019 10:48 am
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Joined: Mon Feb 06, 2012 6:13 pm
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Location: D'town, LA
Post Re: Speed variations from GPS vs. Phone
Which GPS apps were you using in this experiment?


Sat May 25, 2019 7:53 pm
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MMT 1000 Club

Joined: Tue Jan 10, 2012 12:33 pm
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Post Re: Speed variations from GPS vs. Phone
Waze and Motion X

Support your troops. We support you.

B.

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Sat May 25, 2019 8:41 pm
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Joined: Mon Jan 26, 2009 1:22 am
Posts: 114
Post Re: Speed variations from GPS vs. Phone
Waze needs a game warden ahead icon


Tue May 28, 2019 8:20 am
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Post Re: Speed variations from GPS vs. Phone
My Garmin and Samsung S5 Active were dead on for my runs. So I could always check depending on load and whether or not I had my Garmin.


Tue May 28, 2019 9:26 am
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Joined: Mon Feb 06, 2012 6:13 pm
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Location: D'town, LA
Post Re: Speed variations from GPS vs. Phone
My Motion X was spot on with a Garmin handheld. I have a video of it somewhere.


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Tue May 28, 2019 10:09 am
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Location: West Coast Wisconsin
Post Re: Speed variations from GPS vs. Phone
Once you get south of the Mason Dixie line you pick up 3 mph also.


Wed May 29, 2019 11:20 am
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Joined: Mon Jul 14, 2014 8:19 am
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Post Re: Speed variations from GPS vs. Phone


Wed May 29, 2019 6:11 pm
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Post Re: Speed variations from GPS vs. Phone
We call it a patriotic boost lol :D


Wed May 29, 2019 6:54 pm
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Post Re: Speed variations from GPS vs. Phone

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Wed May 29, 2019 8:12 pm
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Joined: Fri Jan 10, 2014 1:16 pm
Posts: 2107
Location: Gladewater TX
Post Re: Speed variations from GPS vs. Phone
Good info, I had to go look up coriolis effect, lol


Thu May 30, 2019 12:05 am
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MMT F.E.

Joined: Mon Jul 14, 2014 8:19 am
Posts: 981
Post Re: Speed variations from GPS vs. Phone
I have a friend that swears he was riding a creek and the moment he went south of I-10, he felt his boat gain 3mph and his lower unit gain 3 inches.


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Thu May 30, 2019 7:37 am
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Post Re: Speed variations from GPS vs. Phone
:lol:


Thu May 30, 2019 9:58 am
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